The patch for bug #6263 removes the only line that made use of classes/submission/reviewAssignment/ReviewAssignmentDAO->getCompletedReviewCounts() - it also generated incorrect values, and is best removed to prevent dead code.

technically getCompletedReviewCountsForReviewForms wasn't orphaned by any work in 6263, so perhaps a better idea is to remove it as part of a "dead code removal" ticket (or tickets). I can add it to this patch, too, but it's probably not the only function that's still in there but never gets used.